Michigan Communicable Disease Surveillance — MDSS Data
Communicable disease tracks Michigan communicable-disease surveillance from MDSS, with weekly county case counts for measles, hepatitis, Lyme, salmonella, and other reportable illnesses. The reading is aggregated by Michigan Gateway from Michigan Disease Surveillance System (MDSS) · MDHHS, an authoritative public source, and refreshed when the upstream source publishes new data.
For Michigan residents this indicator is one of several public-health signals that inform day-to-day decisions — from whether it's safe to be outdoors to whether a specific community needs additional attention. Combined with the other health indicators listed at the bottom of this page, it helps residents, journalists, and county officials build a fuller picture of current conditions in Michigan.
The Michigan Disease Surveillance System (MDSS) is the secure web-based platform that healthcare providers and labs use to report 90+ legally reportable conditions to the state in real time — from common infections like Lyme and salmonella to rare ones like Creutzfeldt-Jakob and anthrax. Aggregate reports are released weekly. MDSS data is what drives public-health response when a case cluster emerges.
- Suspect a reportable illness? Your doctor or lab will file it for you.
- For unusual illness clusters (e.g., 3+ people sick after the same event): call your county health department directly.
- Tick-bite illnesses (Lyme, anaplasmosis): see https://www.michigan.gov/mdhhs/keep-mi-healthy/communicablediseases/ticks-michigan
- For travel-related concerns or international exposures, the CDC Travel page covers risks by destination.